Patents by Inventor Toshiyuki Ugai
Toshiyuki Ugai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6835521Abstract: To provide a process for producing toner particles in a good efficiency which have less residue of monomers and less other organic volatile components, the process has a polymerization step of polymerizing a polymerizable monomer composition containing at least a polymerizable monomer, in a vessel holding therein an aqueous medium, wherein a high-temperature saturated steam with a temperature higher than 100° C. is introduced into the aqueous medium held in the vessel, at the latter half of polymerization or after the polymerization has been completed, to remove at least organic volatile components from toner particles having at least a binder resin and a colorant.Type: GrantFiled: January 24, 2003Date of Patent: December 28, 2004Assignee: Canon Kabushiki KaishaInventors: Yoshinori Tsuji, Toshiyuki Ugai, Akira Hashimoto, Hidekazu Fumita
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Publication number: 20040259018Abstract: To provide a process for producing toner particles in a good efficiency which have less residue of monomers and less other organic volatile components, the process has a polymerization step of polymerizing a polymetizable monomer composition containing at least a polymerizable monomer, in a vessel holding therein an aqueous medium, wherein a high-temperature saturated steam with a temperature higher than 100° C. is introduced into the aqueous medium held in the vessel, at the latter half of polymerization or after the polymerization has been completed, to remove at least organic volatile components from toner particles having at least a binder resin and a colorant.Type: ApplicationFiled: July 13, 2004Publication date: December 23, 2004Applicant: CANON KABUSHIKI KAISHAInventors: Yoshinori Tsuji, Toshiyuki Ugai, Akira Hashimoto, Hidekazu Fumita
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Publication number: 20030224276Abstract: To provide a process for producing toner particles in a good efficiency which have less residue of monomers and less other organic volatile components, the process has a polymerization step of polymerizing a polymerizable monomer composition containing at least a polymerizable monomer, in a vessel holding therein an aqueous medium, wherein a high-temperature saturated steam with a temperature higher than 100° C. is introduced into the aqueous medium held in the vessel, at the latter half of polymerization or after the polymerization has been completed, to remove at least organic volatile components from toner particles having at least a binder resin and a colorant.Type: ApplicationFiled: January 24, 2003Publication date: December 4, 2003Inventors: Yoshinori Tsuji, Toshiyuki Ugai, Akira Hashimoto, Hidekazu Fumita
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Patent number: 6346356Abstract: A toner is comprised of toner particles containing at least a binder resin, a colorant, a wax component and an oxycarboxylic acid. The toner satisfies the following conditions: 1.05≦A/B≦3.00, and 0.15≦B≦3.50 wherein A (mg) is a weight of oxycarboxylic acid extracted with methanol from 1 g of the toner, and B (mg) is a weight of oxycarboxylic acid extracted with an aqueous 0.1 mol/liter sodium hydroxide solution from 1 g of the toner.Type: GrantFiled: May 17, 2000Date of Patent: February 12, 2002Assignee: Canon Kabushiki KaishaInventors: Manabu Ohno, Toshiyuki Ugai, Ryoichi Fujita, Shinya Yachi, Yasushi Katsuta, Kenichi Nakayama
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Patent number: 6285848Abstract: An electrophotographic apparatus includes an electrophotographic photosensitive member, and (i) a charger, (ii) an imagewise exposure device, (iii) a developing device and (iv) a transfer device, disposed in this order opposite to the photosensitive member. The charger includes a charging member including magnetic particles disposed in contact with the photosensitive member so as to charge the photosensitive member based on a voltage received thereby. The magnetic particles are surface-coated with a coupling agent having a linear alkyl group having a least 6 carbon atoms. The developing device also functions to recover residual toner remaining on the photosensitive member processing by the transfer device and the charger. Because of the coating with such a specific coupling agent, the charging magnetic particles can exhibit good triboelectric changeability for the transfer residual toner for a long period.Type: GrantFiled: June 8, 1998Date of Patent: September 4, 2001Assignee: Canon Kabushiki KaishaInventors: Shuichi Aita, Kenji Okado, Toshiyuki Ugai, Ryoichi Fujita, Fumihiro Arahira, Kiyoshi Mizoe, Yoshifumi Hano
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Patent number: 6054244Abstract: A process for producing a toner comprises the steps of: adjusting to 4.0 to 6.0 the pH of an aqueous medium containing a calcium phosphates obtained by mixing an aqueous phosphate solution with an aqueous calcium salt solution; dispersing in the aqueous medium a polymerizable monomer composition having at least a polymerizable monomer, a colorant, a polar polymer or polar copolymer having a carboxyl group, and a polymerization initiator to form particles of the polymerizable monomer composition; in the aqueous medium, polymerizing the polymerizable monomer contained in the particles to form toner particles; and adjusting the pH of the aqueous medium to 1.0 to 3.0 to dissolve the calcium phosphate, followed by separating the toner particles from the aqueous medium. The circularity of the toner obtained is not less than 0.970 and less than 1.000 as measured with a flow-type particle image analyzer (FIPA).Type: GrantFiled: December 23, 1998Date of Patent: April 25, 2000Assignee: Canon Kabushiki KaishaInventors: Kazunori Kato, Toshiyuki Ugai, Satoshi Yasuda
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Patent number: 6030737Abstract: A non-magnetic toner for developing an electrostatic image has non-magnetic toner particles produced by polymerizing in an aqueous medium a polymerizable monomer composition containing at least a polymerizable monomer, a carbon black and an azo type iron compound. The carbon black has a DPB oil absorption of from 110 ml/100 g to 200 ml/100 g, a specific surface area of 100 m.sup.2 /g or below as measured by nitrogen adsorption, a volatile component of 2% or less and an average primary particle diameter of from 20 m.mu. to 60 m.mu., and the azo type iron compound is a compound represented by the following Formula (1).Type: GrantFiled: November 12, 1997Date of Patent: February 29, 2000Assignee: Canon Kabushiki KaishaInventors: Toshiyuki Ugai, Kenji Okado
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Patent number: 6015647Abstract: A toner for developing an electrostatic image is composed of toner particles containing at least a binder resin, a colorant and a wax composition. The wax composition comprises an ester wax (1) having a long-chain alkyl group, and a wax (2). The wax (2) shows a maximum heat-absorption peak in a range of 40-130.degree. C. on temperature increase on a DSC (differential scanning calorimeter) curve, and gives a .sup.13 C-NMR (nuclear magnetic resonance) spectrum showing a total peak area S in a range of 0-50 ppm, a total peak area S1 in a range of 36-42 ppm, and a total peak area S2 in a range of 10-17 ppm, satisfying: 1.0.ltoreq.(S1/S).times.100.ltoreq.10, 1.5.ltoreq.(S2/S).times.100.ltoreq.15, and S.sub.1 <S.sub.2. The toner particles contain A wt. parts of the ester wax (1), B wt. parts of the wax (2) and C wt. parts of the colorant, respectively per 100 wt. parts of the binder resin, satisfying: 3.ltoreq.A.ltoreq.30, 0.2.ltoreq.B.ltoreq.10, 4.ltoreq.A+B.ltoreq.40, 0.02.ltoreq.B/A.ltoreq.0.5, and 0.02.Type: GrantFiled: April 13, 1999Date of Patent: January 18, 2000Assignee: Canon Kabushiki KaishaInventors: Toshiyuki Ugai, Manabu Ohno
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Patent number: 5994019Abstract: An image forming method is disclosed in which a contact charging means is brought into contact with a latent image bearing member to electrostatically charge the latent image bearing member on which electrostatic latent images are formed and developed with a one component type or two component type developer to form toner images, using a developing assembly provided with a developing container and a developer carrying member. The one component developer is comprised of toner particles. The two component type developer is comprised of toner particles and a magnetic carrier. The toner particles of the one component type and two component type developers contains fine particles as an external additive.The latent image bearing member has a surface layer having a volume resistivity A of from 10.sup.8 to 10.sup.15 .OMEGA..multidot.Type: GrantFiled: November 26, 1997Date of Patent: November 30, 1999Assignee: Canon Kabushiki KaishaInventors: Kenji Okado, Toshiyuki Ugai, Ryoichi Fujita, Kazumi Yoshizaki
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Patent number: 5989770Abstract: A process for producing a toner for developing an electrostatic latent image. The process has the steps of dispersing in an aqueous medium having a pH of from 4.5 to 8.5 a polymerizable monomer composition containing at least a polymerizable vinyl monomer, a colorant, an organic metal compound, an aromatic carboxylic acid, a polyester resin having an acid value of from 5 mg.multidot.KOH/g to 50 mg.multidot.KOH/g, and a polymerization initiator, to form particles of the polymerizable monomer composition in the aqueous medium, and polymerizing the polymerizable vinyl monomer in the particles of the polymerizable monomer composition.Type: GrantFiled: January 28, 1999Date of Patent: November 23, 1999Assignee: Canon Kabushiki KaishaInventors: Toshiyuki Ugai, Satoshi Yasuda, Kazunori Kato
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Patent number: 5885742Abstract: A carrier for electrophotography has carrier particles. Each carrier particle has a carrier core and a silicone resin coat layer that covers the carrier core. The carrier particle has silicon atoms and carrier atoms on its surface in the ratio that satisfies the condition of Si/C=0.1 to 2.0 as the number of atoms present on the carrier particle surface as measured by X-ray photoelectron spectroscopy, and from 0.1% by number to 5% by number of metal atoms are present on the carrier particle surface. Additionally, there is a two-component developer for developing electrostatic images which consists of a toner and the carrier. An image forming method in which the two-component developer having the toner and the carrier is transported to a developing zone which is defined by a latent image carried on a latent image bearing member to develop the latent image. A voltage is applied to the developer to direct the toner from the latent image bearing member to a member carrying the developer.Type: GrantFiled: October 3, 1997Date of Patent: March 23, 1999Assignee: Canon Kabushiki KaishaInventors: Kenji Okado, Toshiyuki Ugai, Ryoichi Fujita, Tsuyoshi Takiguchi
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Patent number: 5856055Abstract: An electrophotographic black toner containing carbon black in a good dispersion state as well as a combined charge control agent system including a specific azo iron metal compound of formula (1) shown below and an oxycarboxylic acid metal compound is produced through polymerization in an aqueous system. The combined charge control agent system shows an effects of synergistically improving the chargeability of spherical polymerized toner particles. The azo iron metal compound improves the dispersion of the carbon black in the toner particles. ##STR1## wherein the denotations of R.sub.1 -R.sub.6, n, n' and A.sup..sym. are omitted.Type: GrantFiled: March 31, 1998Date of Patent: January 5, 1999Assignee: Canon Kabushiki KaishaInventors: Toshiyuki Ugai, Kazumi Yoshizaki
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Patent number: 5774771Abstract: An image forming method has a developing step of developing an electrostatic latent image by the use of a developer to form a toner image on an electrostatic latent image bearing member, a primary transfer step of transferring the toner image onto an intermediate transfer member to which a voltage is applied, and a secondary transfer step of transferring onto a transfer medium the toner image held on the intermediate transfer member, while a transfer means to which a voltage is applied is pressed against the transfer medium. The developer has a toner. The toner is a black toner having at least i) black toner particles formed of a binder resin with a colorant dispersed therein and ii) an inorganic fine powder. The black toner has the value of shape factor SF-1 of 110<SF-1.ltoreq.180, the value of shape factor SF-2 of 110<SF-2.ltoreq.140, and the value of ratio B/A of 1.Type: GrantFiled: February 9, 1996Date of Patent: June 30, 1998Assignee: Canon Kabushiki KaishaInventors: Tsutomu Kukimoto, Motoo Urawa, Kenji Okado, Toshiyuki Ugai, Keita Nozawa, Satoshi Yoshida, Yuki Karaki
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Patent number: 5733702Abstract: An image forming method is conducted by forming a toner image on a latent image bearing member containing an organic photoconductive material. The latent image bearing member includes a photosensitive layer containing an organic photoconductive material and a protective layer which contains fluorine-containing resin particles in an amount from 5% by weight to 40% by weight. The toner contains toner particles and external additives. The external additives include titanium oxide particles having a weight average particle diameter from 0.01 .mu.m to 0.2 .mu.m having been subjected to hydrophobic treatment, organic resin particles having a weight average particle diameter from 0.02 .mu.m to 0.5 .mu.m, and inorganic compound particles having a weight average particle diameter from 0.5 .mu.m to 2.5 m.The inorganic compound particles may be specific titanates, oxides or carbonate.Type: GrantFiled: April 5, 1995Date of Patent: March 31, 1998Assignee: Canon Kabushiki KaishaInventors: Kenji Okado, Toshiyuki Ugai, Ryoichi Fujita, Tsuyoshi Takiguchi, Yasuhiro Ichikawa
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Patent number: 5698354Abstract: An image-forming method is comprised of delivering a transfer-receiving medium to a first image-forming unit, forming a first toner image by a first image-forming means of the first image-forming unit, transferring the first toner image onto the transfer-receiving medium at a first transfer section of the first image-forming unit with a first transfer bias applied, and delivering the transfer-receiving medium to a second image-forming unit. Forming a second toner image by a second image-forming means of the second image-forming unit, transferring the second toner image onto the transfer-receiving medium carrying the first toner image at a second transfer section of the second image-forming unit with a second transfer bias applied, fixing the first toner image and the second toner image transferred on the transfer-receiving medium by a fixing means.Type: GrantFiled: February 9, 1996Date of Patent: December 16, 1997Assignee: Canon Kabushiki KaishaInventors: Toshiyuki Ugai, Tatsuya Nakamura
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Patent number: 5670288Abstract: A carrier for electrophotography has carrier particles. The carrier has a 50% average particle diameter (D.sub.50) of from 15 .mu.m to 45 .mu.m and contains from 1% to 20% of carrier particles with a size smaller than 22 .mu.m, not more than 3% of carrier particles with a size smaller than 16 .mu.m, from 2% to 15% of carrier particles with a size of 62 .mu.m or larger, and not more than 2% of carrier particles with a size of 88 .mu.m or larger. The carrier has a specific surface area S.sub.1 as measured by an air-permeability method and a specific surface area S.sub.2 as calculated by the following expression:S.sub.2 =(6/.rho..multidot.D.sub.50).times.10.sup.4wherein .rho. is a specific gravity of carrier; satisfying the following condition:1.2 .ltoreq.S.sub.1 /S.sub.2 .ltoreq.2.0.Type: GrantFiled: February 12, 1996Date of Patent: September 23, 1997Assignee: Canon Kabushiki KaishaInventors: Kenji Okado, Toshiyuki Ugai, Ryoichi Fujita, Makoto Kanbayashi, Tsuyoshi Takiguchi, Yasuhiro Ichikawa, Wakashi Iida
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Patent number: 5637432Abstract: The present invention provides a toner for developing an electrostatic image, comprising toner particles and external additives, wherein;said external additives comprise (A) titanium oxide particles having a weight average particle diameter of from 0.01 .mu.m to 0.2 .mu.m, having been subjected to hydrophobic treatment, (B) organic resin particles having a weight average particle diameter of from 0.02 .mu.m to 0.5 .mu.m and (C) an inorganic compound having a weight average particle diameter of from 0.5 .mu.m to 2.5 .mu.m; said external additives being added in an amount satisfying the relationship:(A):(B)=2:1 to 10:1(A):(C)=1:1 to 5:1; andsaid toner contains toner particles having a particle diameter of from 2 .mu.m to 5 .mu.m in an amount of from 15% by number to 40% by number.Type: GrantFiled: February 28, 1995Date of Patent: June 10, 1997Assignee: Canon Kabushiki KaishaInventors: Kenji Okado, Toshiyuki Ugai, Ryoichi Fujita, Tsuyoshi Takiguchi, Yasuhiro Ichikawa
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Patent number: 5512402Abstract: A carrier for electrophotography has carrier particles. The carrier has a 50% average particle diameter (D.sub.50) of from 15 .mu.m to 45 .mu.m and contains from 1% to 20% of carrier particles with a size smaller than 22 .mu.m, not more than 3% of carrier particles with a size smaller than 16 .mu.m, from 2% to 15% of carrier particles with a size of 62 .mu.m or larger, and not more than 2% of carrier particles with a size of 88 .mu.m or larger. The carrier has a specific surface area S.sub.1 as measured by an air-permeability method and a specific surface area S.sub.2 as calculated by the following expression:S.sub.2 =(6/.rho..D.sub.50).times.10.sup.4wherein .rho. is a specific gravity of carrier; satisfying the following condition:1.2.ltoreq.S.sub.1 /S.sub.2 .ltoreq.2.0.Type: GrantFiled: May 19, 1994Date of Patent: April 30, 1996Assignee: Canon Kabushiki KaishaInventors: Kenji Okado, Toshiyuki Ugai, Ryoichi Fujita, Makoto Kanbayashi, Tsuyoshi Takiguchi, Yasuhiro Ichikawa, Wakashi Iida
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Patent number: 5102761Abstract: A color toner for developing an electrostatic latent image, which includes a binder resin, a xanthene-type dye and a compound containing a phenolic --OH (hydroxyl) group.Type: GrantFiled: May 1, 1990Date of Patent: April 7, 1992Assignee: Canon Kabushiki KaishaInventors: Ichiro Ohsaki, Takaaki Kohtaki, Yuko Sato, Hiroyuki Kobayashi, Toshiyuki Ugai